I don't get any thing about adding subtraction dividing or multiply fractions

its easy

Step-by-step explanation:

for example for addition,

15+4/5

=here we will take the LCM of 1 and 5

LCM=5

to make the denominator 5 we should divide

15/1+4/5

=75/5+4/5

=79/5

for division,

3/2:5/4

just wright the reciprocal of 5/4

=3/2*4/5

here no need to find LCM, u can just multiply the no. just next to it

=12/10 is the ans